I know, but that's a single J2 among hundreds of non-J2 Neolithic lineages. There was also a J2a in Barcın, who IMO was an Anatolian Mesolithic HG assimilated by Neolithic farmers, considering the low J2 frequency overall among Neolithic farmers in Europe, Anatolia and the Levant.
There was also a J2b sample from Pre-Pottery Neolithic Iran, and that points at a more eastern origin for J2b. I had already mentioned in several threads and on the J2 page for the last 3 years that J2b2 moved to the Steppe and integrated PIE society before the PIE migrations, as J2b2 has a distribution paralleling those of R1a1a and R1b-M269. I have now been able to determine that J2b2 moved across the Caucasus and went to the Volga-Ural region during the Neolithic, possibly bringing along some mt-haplogroups J1c, T2 and W (e.g. W3 and W6). As a minor lineage within the R1a-Z93 dominant populations, it would have expanded from the Volga-Ural region to Central and South Asia with the Indo-Aryan invasions. Nowadays, J2b2 is very common in the Volga-Ural region, but also at low frequencies all over Central and South Asia, the Middle East, as well as East and Central Europe, just like Y-haplogroup R1a.
Yes, there was two late Neolithic J2's in Sopot and Lengyel (Hungary). At the time they were not tested downstream of J2-M172, so their subclades are unknown. My guess is that they both are more likely to turn out J2a.
Regarding J2b2a-M241, your analysis seems to be all wrong! Just because you see a spot of it in Volga region, it doesn't mean it was spread from the Steppe to South Asia and Europe.
J2b2a-M241 split in early Neolithic to J2b2a-L283 (Balkans/Europe) and J2b2a-Z2432 (South Asia): https://www.yfull.com/tree/J-M241/
All indications are that the Neolithic split was somewhere in the area of Western Iran to Caucasus with Z2432 expanding into South Asia during the Neolithic. As you can see the South Asian Z2432 branch has a TMRCA of ~7100 ybp, which is much earlier than Indo-Aryan expansion to the area.
The harder question at this point is when the 'European' L283 branch (TMRCA 5900 ybp) arrived to SE Europe. It seems most likely it was in the period between the Chalcolithic to Early Bronze Age. This is reinforced by the fact that RISE408 LBA Armenia was tested as J2b2a-L283>Z600 (xZ627), which is en early split of L283. The more likely migration was from Armenia/Anatolia to SE Europe through northern Anatolia, or even straight through the Black Sea would be possible. I suppose L283 could've gone north through the Caucuses to the Steppe and became part of BA expansion to SE Europe, but it seems unlikely at this point. Also the Volga-Ural J2b2a-L283 belongs all under J-Y12000 and has a TMRCA of 1600 ybp, as you can see on the bottom of L283 YFull tree.
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